X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 28 May 2008 22:26:54 -0400 Message-ID: X-Original-Return-Path: Received: from sfa.gami.com ([68.89.254.162] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2943404 for lml@lancaironline.net; Wed, 28 May 2008 22:16:01 -0400 Received-SPF: none receiver=logan.com; client-ip=68.89.254.162; envelope-from=gwbraly@gami.com Received: from localhost (localhost.localdomain [127.0.0.1]) by sfa.gami.com (Postfix) with ESMTP id 9ED0C29C084 for ; Wed, 28 May 2008 21:15:24 -0500 (CDT) Received: from gamimail1.Gami.local (unknown [10.10.10.33]) by sfa.gami.com (Postfix) with ESMTP id 3F5F829C080 for ; Wed, 28 May 2008 21:15:24 -0500 (CDT) Received: from gamimail1.Gami.local ([10.10.10.33]) by gamimail1.Gami.local ([10.10.10.33]) with mapi; Wed, 28 May 2008 21:15:22 -0500 From: George Braly X-Original-To: Lancair Mailing List X-Original-Date: Wed, 28 May 2008 21:14:06 -0500 Subject: RE: [LML] Re: Electronic ignition spark plugs Thread-Topic: [LML] Re: Electronic ignition spark plugs Thread-Index: Aci85/f+rjTXrvd2SmOgdPgWojDGsgESJmig X-Original-Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBE1gamimail1Gami_" MIME-Version: 1.0 X-Virus-Scanned: by amavisd-new-2.3.2 (20050629) (Debian) at gami.com --_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBE1gamimail1Gami_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable All of those people using automotive spark plugs in their high performance = aircraft engine, please make yourself known and - - - tell the rest of us = what the temperature is of ceramic insulator of your automotive spark plug= s when the engine is operating under high power hot day certification cond= itions? Please! Step forward and give us the hard numbers? ********* long pause for reality check *********** I can tell you the answer to that question with respect to an aviation spar= k plug. But unless somebody has measured it - - you really don't have any idea - -= - do you? And keep in mind that 25 to 50 degrees "too hot" can make all the differenc= e between "OK" and pre-ignition disaster as some have experienced. That fact that ANYONE has experienced a pre-ignition disaster due to an aut= omotive spark plug - - - is a VERY good reason for everyone else to NOT use= those plugs until SOMEBODY has measured the ceramic temperatures. Regards, George Braly PS. It is REALLY hard to get a valid signal from a thermocouple in a spa= rk plug inside a cylinder and to get a valid reading when the thermocouple = is sitting about 1/8th inch away from an electrode that is discharging 25KV= about 22 times each second. Really. It can be done. But it is not for t= he faint of heart. ________________________________ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Domi= nic V Crain Sent: Friday, May 23, 2008 10:15 AM To: lml@lancaironline.net Subject: [LML] Re: Electronic ignition spark plugs 1. Consistent large gap. 2. Small electrodes that don't block the flame. 3. Great spark exposure to F/A mix (see 2). 4. Electrodes don't wear. 5. Great endurance. 6. Can you go wrong with a well designed moped plug? Nah! 7. Cheap - merely US$ 11 per plug (I use Denso IK27 with my Light Speed Eng= . EI). SOLD! Thanks Grayhawk Cheers Dom --_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBE1gamimail1Gami_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
 
All of those people using automotive spark plugs= in=20 their high performance aircraft engine, please make yourself known and - -= =20 -  tell the rest of us what the temperature is of  ceramic insula= tor=20 of your automotive spark plugs when the engine is  operating under high power hot day&= nbsp;certification conditions?
 
Please!  Step forward and give us the hard= =20 numbers?  
 
        =           =20 *********    long pause for reality check=20 ***********
 
I<= SPAN=20 class=3D613120602-29052008> can tell you the answer to that question with r= espect=20 to an aviation spark plug.
 =
But unless somebody has measured it - - you real= ly=20 don't have any idea  - - -  do=20 you?
 =
And keep in mind that 25 to 50 degrees "too hot"= can=20 make all the difference between "OK"  and pre-ignition disaster as som= e=20 have experienced.
 =
That fact that ANYONE has experienced a pre-igni= tion=20 disaster due to an automotive spark plug - - - is a VERY good reason for=20 everyone else to NOT use those plugs until SOMEBODY has measured the cerami= c=20 temperatures.
 =
Regards,  George Braly =20
=  =
PS.  It is  REALLY hard to get a valid= signal=20 from a  thermocouple in a spark plug inside a cylinder and to get a va= lid=20 reading when the thermocouple is sitting about 1/8th inch away from an elec= trode=20 that is discharging 25KV about 22 times each second.  Really.  It= can=20 be done.  But it is not for the faint of=20 heart.
 =

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Dominic V=20 Crain
Sent: Friday, May 23, 2008 10:15 AM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Electronic ignition spar= k=20 plugs

 

1.=20 Consistent large gap.

 

2.=20 Small electrodes that don't block the flame.

 

3.=20 Great spark exposure to F/A mix (see 2).

 

4.=20 Electrodes don't wear.

 

5.=20 Great endurance.

 

6.=20 Can you go wrong with a well designed moped plug? Nah!

 

7.=20 Cheap - merely US$ 11 per plug (I use Denso IK27 with my Light Speed=20 Eng.=20 EI).

<= SPAN=20 style=3D"FONT-SIZE: 16pt; COLOR: blue"> 

<= SPAN=20 style=3D"FONT-SIZE: 16pt; COLOR: blue">SOLD!

<= SPAN=20 style=3D"FONT-SIZE: 16pt; COLOR: blue"> 

<= SPAN=20 style=3D"FONT-SIZE: 12pt; COLOR: blue">Thanks Grayhawk

<= SPAN=20 style=3D"FONT-SIZE: 12pt; COLOR: blue"> 

<= SPAN=20 style=3D"FONT-SIZE: 12pt; COLOR: blue">Cheers

<= SPAN=20 style=3D"FONT-SIZE: 12pt; COLOR: blue">Dom

<= SPAN=20 style=3D"FONT-SIZE: 12pt; COLOR: blue"> 

&= nbsp;

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